Simplified the README example.

Instead of getting tricky with .tap, we should be keeping it readable.
Merge pull request #76 from jrgifford/fix-readme-example

Simplified the README example.
use update_attributes rather than private update method
Merge pull request #79 from nickurban/master

README shows call to person.update, should be person.update_attributes
removes unnecessary autoload

If this line runs the constant is already defined because it is
defined in this very file.
prefer strings to regexps in assert_match
Fix Ruby warning: shadowing outer local variable - value
Merge pull request #84 from cgriego/fix-warning

Fix Ruby warning: shadowing outer local variable - value